Land clearing, climate variability, and water resources increase in semiarid southwest Niger: A review

Water Resources Research

Volumn 45, Issue 7, 2009, Pages

  Favreau, G ^a   Cappelaere, B ^a   Massuel, S ^b   Leblanc, M ^c   Boucher, M ^a   Boulain, N ^a   Leduc, C ^a  

^a INSTITUT DE RECHERCHE POUR LE DÉVELOPPEMENT   (France)

^b CSIRO   (Australia)

^c JAMES COOK UNIVERSITY   (Australia)

Author keywords

[No Author keywords available]

Indexed keywords

AERIAL PHOTOGRAPHS; ANALYTICAL MODELING; AQUIFER RECHARGE; CHANGE IN LAND USE; CLIMATE VARIABILITY; DISTRIBUTED HYDROLOGICAL MODEL; GEOPHYSICAL SURVEYS; GROUNDWATER FLUXES; GROUNDWATER LEVEL FLUCTUATION; GROUNDWATER QUALITY; LAND CLEARING; LAND-USE CHANGE; LOCAL SCALE; N VALUE; NIGER; NITRATE CONCENTRATION; ORDER OF MAGNITUDE; PHYSICALLY BASED; RECHARGE RATES; SOIL CRUSTING; STUDY AREAS; WATER QUANTITIES; WATER TABLES;

AQUIFERS; CLIMATE CHANGE; GROUNDWATER RESOURCES; HYDROGEOLOGY; LAND USE; PHOTOGRAPHY; RADIOISOTOPES; RECHARGING (UNDERGROUND WATERS); RUNOFF; WATER QUALITY;

HYDRAULIC MODELS;

AERIAL PHOTOGRAPHY; CLIMATE VARIATION; LAND USE CHANGE; LITERATURE REVIEW; MILLET; NITRATE; PERENNIAL PLANT; POND; RADIONUCLIDE; RAINFALL-RUNOFF MODELING; RECHARGE; SAVANNA; SEMIARID REGION; SOIL CRUSTING; WATER LEVEL; WATER QUALITY; WATER RESOURCE; WATER TABLE;

AFRICA; NIGER [NIGERIA]; NIGERIA; SUB-SAHARAN AFRICA; WEST AFRICA;

HORTONIA;

EID: 69249130031     PISSN: 00431397     EISSN: None     Source Type: Journal    
DOI: 10.1029/2007WR006785     Document Type: Article

References (126)

1. Albergel, J. (1987), Sécheresse, désertification, et ressources en eau de surface: Application aux petits bassins du Burkina-Faso, in The Influence of Climate Change and Climate Variability on the Hydrologic Regime and Water Resources, edited by S. I. Solomon, M. Beran, and W. Hogg, IAHS Publ., 168, 355-365.
2. Allison, G. B., P. G. Cook, S. R. Bamett, G. R. Walker, I. D. Jolly, and M. W. Hughes (1990), Land clearance and river salinisation in the western Murray Basin, Australia, J. Hydrol., 119, 1-20, doi: 10.1016/0022-1694(90)90030-2.
3. Balme, M., T. Lebel, and A. Amani (2006a), Dry years and wet years in the Sahel: Quo vadimus?, Hydrol. Sci. J., 51, 254-271, doi: 10.1623/hysj.51.2.254.
4. Balme, M., T. Vischel, T. Lebel, C. Peugeot, and S. Galle (2006b), Assessing the water balance in the Sahel: Impact of small scale rainfall variability on runoff. Part 1: Rainfall variability analysis, J. Hydrol., 331, 336-348, doi: 10.1016/j.jhydrol.2006.05.020. (Pubitemid 44646466)
5. Barber, W., and B. Dousse (1965), Rise in the water-table in parts of Potiskum division, Bomu province. Further observations, Rec. Geol. Surv. Nigeria, 9, 41-57.
6. Barbiéro, L., and B. Van Vliet-Lanoë (1998), The alkali soils of the middle Niger valley: Origins, formation and present evolution, Geoderma, 84, 323 - 343, doi: 10.1016/S0016-7061 (98)00003-12
7. Bari, M. A., and N. J. Schofield (1992), Lowering of a shallow, saline water table by extensive eucalypt reforestation, J. Hydrol., 133, 273-291, doi: 10.1016/0022-1694(92)90259-X.
8. Barnes, C. J., G. Jacobson, and G. D. Smith (1992), The origin of high nitrate ground waters in the Australian arid zone, J. Hydrol., 137, 181-197, doi: 10.1016/0022-1694(92)90055-Z.
9. Biroue, W. K., and J. L. Schneider (1993), Towards the drying of the water table aquifer in the Chad Sahel?, C R. Acad. Set, Ser. II, 317, 89-92.
10. Boeckh, E. (1965), Contribution à l'étude hydrogéologique de la zone sédentaire de la république du Niger, Tech. Rep. BRGM/BFBH, DAK65-A20, Dakar.
11. Boucher, M., G. Favreau, J.-M. Vouillamoz, Y. Nazoumou, and A. Legchenko (2009), Estimating specific yield and transmissivity with magnetic resonance sounding in an unconfined sandstone aquifer (Niger), Hydrogeol. J., in press.
12. Bromley, J., W. M. Edmunds, E. Fellman, J. Brouwer, S. R. Gaze, J. Sudlow, and J.-D. Taupin (1997), Estimation of rainfall inputs and direct recharge to the deep unsaturated zone of southern Niger using the chloride profile method, J. Hydrol., 188-189, 139-154, doi: 10.1016/S0022-1694(96)03157- 3165
13. Brunei, J. P., G. R. Walker, J. C. Dighton, and B. Monteny (1997), Use of stable isotopes of water to determine the origin of water used by the vegetation and to partition evapotranspiration. A case study from HAPEX-Sahel, J. Hydrol., 188-189, 466-481, doi: 10.1016/S0022-1694(96)03188-5.
14. Buerkert, A., and P. Hiemaux (1998), Nutrients in the West African Sudano-Sahelian zone: Losses, transfers and role of external inputs, Z. Pflanzenernaehr Bodenkd., 161, 365-383.
15. Canadell, J., R. B. Jackson, J. R. Ehleringer, H. A. Mooney, O. E. Sala, and E. D. Schulze (1996), Maximum rooting depth of vegetation types at the global scale, Oecologia, 108, 583-595, doi: 10.1007/BF00329030.
16. Cappelaere, B., B. E. Vieux, C. Peugeot, A. Maia, and L. Seguis (2003), Hydrologic process simulation of a semiarid, endoreic catchment in Sahelian West Niger, Africa. 2. Model calibration and uncertainty characterization, J. Hydrol., 279, 244-261, doi: 10.1016/S0022-1694(03)00182-3.
17. Carter, J. D., and W. Barber (1958), The rise in the water-table in parts of Potiskum division, Bomu province, Rec. Geol. Surv. Nigeria, 5, 5-13.
18. 14C and chloride concentrations: Application to dual-porosity aquifers in dryland salinity areas, Murray basin, Australia, J. Hydrol., 332, 69-92, doi: 10.1016/j.jhydrol.2006.06.034.
19. Casenave, A., and C. Valentin (1992), A runoff capability classification system based on surface features criteria in semiarid areas of West Africa, J. Hydrol., 130, 231-249, doi: 10.1016/0022-1694(92)90112-9.
20. Charreau, C., and R. Fauck (1970), Mise au point sur l'utilisation agricole des sols de la region de Séfa (Casamance), Agron. Trop. Paris, 25, 151-191.
21. Crosbie, R. S., P. Binning, and J. D. Kalma (2005), A time series approach to inferring groundwater recharge using the water table fluctuation method, Water Resour Res., 41, W01008, doi: 10.1029/2004WR003077. (Pubitemid 40359288)
22. D'Herbès, J.-M., and C. Valentin (1997), Land surface conditions of the Niamey region: Ecological and hydrological implications, J. Hydrol., 188-189, 18-42, doi: 10.1016/S0022-1694(96)03153-8. (Pubitemid 27268690)
23. D'Orgeval, T., and J. Polcher (2008), Impact of precipitation events and land use changes on West African river discharges during the years 1951-2000, Clim. Dyn., 31, 249-262, doi: 10.1007/s00382-007-0350-x.
24. De Vries, J. J., E. T. Selaolo, and H. E. Beekman (2000), Groundwater recharge in the Kalahari, with reference to paleo-hydrologic conditions, J. Hydrol., 238, 110-123, doi: 10.1016/S0022-1694(00)00325-335
25. Deans, J. D., W. M. Edmunds, D. K. Lindley, C. B. Gaye, B. Dreyfus, J. J. Nizinski, M. Neyra, K. Ingleby, and R. C. Munro (2005), Nitrogen in interstitial waters in the Sahel; natural baseline, pollutant or resource?, Plant Soil, 271, 47-62, doi: 10.1007/slll04-004-1994-5.
26. Desconnets, J.-C, J.-D. Taupin, T. Lebel, and C. Leduc (1997), Hydrology of the Hapex-Sahel central super-site: Surface water drainage and aquifer recharge through the pool systems,/. Hydrol., 188-189, 155-178, doi: 10.1016/S0022-1694(96)03158-7. (Pubitemid 27268696)
27. Edmunds, W. M., W. G. Darling, D. G. Kinniburgh, S. Kotoub, and S. Mahgoub (1992), Sources of recharge in Abu Delaig, Sudan, J. Hydrol., 131, 1-24, doi: 10.1016/0022-1694(92)90211-D.
28. Elbaz-Poulichet, F., G. Favreau, C. Leduc, and J.-L. Seidel (2002), Major ion chemistry of groundwaters in the Continental Terminal water table of southwestern Niger (Africa), Appl. Geochem., 17, 1343-1349, doi: 10.1016/S0883-2927(02)00024-0. (Pubitemid 34842004)
29. Elizondo, D., B. Cappelaere, and C. Faure (2002), Automatic versus manual model differentiation to compute sensitivities and solve non-linear inverse problems, Comput. Geoscl., 28, 309-326, doi: 10.1016/S0098-3004(01)00048-6. (Pubitemid 34495186)
30. Eltahir, A. B., and C. Gong (1996), Dynamics of wet and dry years in West Africa, J. Clim., 9, 1030-1042, doi: 10.1175/1520-0442(1996)0092 1030: DOWADY 2.0.CO;2.
31. Engel, V., E. G. Jobbagy, M. Stieglitz, M. Williams, and R. B. Jackson (2005), Hydrological consequences of Eucalyptus afforestation in the Argentine Pampas, Water Resour Res., 41, W10409, doi: 10.1029/2004WR003761. (Pubitemid 41705694)
32. Esteves, M., and J.-M. Lapetite (2003), A multi-scale approach of runoff generation in a Sahelian gully catchment: A case study in Niger, Catena, 50, 255-271, doi: 10.1016/S0341-8162(02)00136-4. (Pubitemid 36035772)
33. Favreau, G. (1996), Site-scale modelling of groundwater recharge in southwestern Niger (in French), M.S. thesis, Univ. Paris XI, Orsay, France.
34. Favreau, G. (2000), Characterization and modelling of a rising water table in the Sahel: Dynamic and geochemistry of the Dantiandou kori natural hollow aquifer (southwest Niger) (in French), Ph.D. thesis, 258 pp., Univ. Paris XI, Orsay, France.
35. Favreau, G., and C. Leduc (1998), Fluctuations à long terme de la nappe phréatique du Continental Terminal près de Niamey (Niger) entre 1956 et 1997, in Water Resources Variability in Africa During the XXth Century, edited by E. Servat et al., IAHS Publ, 252, 253-258.
36. Favreau, G., C. Leduc, and C. Martin (2000), Reliability of geochemical and hydrodynamic sampling in a semi-arid water table, J. Afr. Earth Sci., 31, 669-678, doi: 10.1016/S0899-5362(00)80014-7. (Pubitemid 32376021)
37. 14C modeling, Ground Water, 40, 144-151, doi: 10.1111/j.1745-6584.2002.tb02499.x.
38. Favreau, G., C. Leduc, and P. Schroeter (2002b), Reply to comment on "Long-term rise in a Sahelian water-table: The Continental Terminal in South-West Niger" by Leduc C, Favreau, G., Schroeter, P., 2001. Journal of Hydrology 243, 43-54, J. Hydrol, 255, 263-265, doi: 10.1016/S0022-1694(01)00517- 0.
39. Favreau, G., C. Leduc, J.-L. Seidel, S. D. Ousmane, and A. Mariotti (2003), Land clearance and nitrate-rich groundwater in a Sahelian aquifer, Niger, in Hydrology of the Mediterranean and Semiarid Regions, edited by E. Servat et al., IAHS Publ., 278, 163-167.
40. 22Ne ratios" by F. Peeters et al. (2003) Geochim. Cosmochim. Acta, 67, 587-600, Geochim. Cosmochim. Acta, 68, 1433-1435, doi: 10.1016/j.gca.2003.07.022.
41. Favreau, G., J.-L. Seidel, C. Leduc, C. Marlin, and A. Mariotti (2004b), Land clearance as the cause of groundwater nitrate increase in semiarid Niger: Evidence using nitrate isotopes, paper presented International Workshop on the Application of Isotope Techniques in Hydrological and Environmental Studies, U. N. Educ, Sci., and Cult. Organ., Paris, France, 6-10 Sept.
42. Favreau, G., M. Boucher, J.-M. Vouillamoz, M. Descloitres, S. Massuel, Y. Nazoumou, and A. Legchenko (2007), Apport des sondages TDEM et RMP a une meilleure estimation des parametres de la modelisation d'un aquifere libre en milieu semi-aride (Niger), paper presented at 6th Colloque Geofcan, Inst, de Rech. Pour le Dev, Bondy, France, 25-26 Sept.
43. Fontes, J.-C, J. N. Andrews, W. M. Edmunds, A. Guerre, and Y. Travi (1991), Paleorecharge by the Niger River (Mali) deduced from ground-water geochemistry, Water Resour. Res., 27, 199-214, doi: 10.1029/90WR01703.
44. Freydier, R., B. Dupre, and J.-P. Lacaux (1998), Precipitation chemistry in intertropical Africa, Atmos. Environ., 32, 749-765, doi: 10.1016/S1352- 2310(97)00342-347
45. Galle, S., M. Ehrmann, and C. Peugeot (1999), Water balance in a banded vegetation pattern. A case study of tiger bush in western Niger, Catena, 37, 197-216, doi: 10.1016/S0341 -8162(98)90060-90061
46. Galy Lacaux, C, and A. I. Modi (1998), Precipitation chemistry in the Sahelian savanna of Niger, Africa, J. Atmos. Chem., 30, 319-343, doi: 10.1023/A: 1006027730377.
47. Gates, J. B., J. K. Bohlke, and W M. Edmunds (2008), Ecohydrological factors affecting nitrate concentrations in a phreatic desert aquifer in northwestern China, Environ. Sci. Technol, 42, 3531-3537, doi: 10.1021/es702478d. (Pubitemid 351694056)
48. Gaze, S. R., J. Brouwer, L. P. Simmonds, and J. Bromley (1998), Dry season water use patterns under Guiera senegalensis L. shrubs in a tropical savanna, J. Arid Environ., 40, 53-67, doi: 10.1006/jare.l998.0435.
49. George, R. J., R. A. Nulsen, R. Ferdowsian, and G. P. Raper (1999), Interaction between trees and groundwaters in recharge and discharge areas-A survey of western Australian sites, Agric. Water Manage., 39, 91-113, doi: 10.1016/S0378-3774(98)00073-0. (Pubitemid 29096823)
50. Girard, P., and C. Hillaire-Marcel (1997), Determining the source of nitrate pollution in the Niger discontinuous aquifers using the natural 15N/, 4N ratios, J. Hydrol, 199, 239-251, doi: 10.1016/S0022-1694(96)03318-5. (Pubitemid 27492869)
51. Goutorbe, J.-P, et al. (1997), An overview of Hapex-Sahel: A study in climate and desertification, J. Hydrol, 188-189, 4-17, doi: 10.1016/S0022- 1694(96)03308-3312.
52. Haarsma, R. J., F. M. Selten, S. L. Weber, and M. Kliphuis (2005), Sahel rainfall variability and response to greenhouse warming, Geophys. Res. Lett, 32, L17702, doi: 10.1029/2005GL023232. (Pubitemid 41536227)
53. Hadjer, K., T. Klein, and M. Schopp (2005), Water consumption embedded in its social context, north-western Benin, Phys. Chem. Earth, 30, 357-364, doi: 10.1016/j.pce.2005.06.014. (Pubitemid 41213639)
54. Healy, R. W., and P. G. Cook (2002), Using groundwater levels to estimate recharge, Hydrogeol. J., 10, 91-109, doi: 10.1007/sl0040-001-0178-0.
55. Heaton, T. H. E. (1984), Sources of the nitrate in phreatic groundwater in the western Kalahari, J. Hydrol., 67, 249-259, doi: 10.1016/0022- 1694(84)90244-90250.
56. Heilweil, V. M., T. S. McKinney, M. S. Zhdanov, and D. E. Watt (2007), Controls on the variability of net infiltration to desert sandstone, Water Resour. Res., 43, W07431, doi: 10.1029/2006WR005113. (Pubitemid 350194483)
57. Held, I. M., T. L. Delworth, J. Lu, K. L. Findell, and T. R. Kmitson (2005), Simulation of Sahel drought in the 20th and 21 st centuries, Proc. Natl. Acad. Sci. U. S. A., 102, 17, 891-17, 896, doi: 10.1073/pnas.0509057102. (Pubitemid 41798472)
58. Hiemaux, P., C. L. Bidders, C. Valentin, A. Bationo, and S. Fernandez-Rivera (1999), Effects of livestock grazing on physical and chemical properties of sandy soils in Sahelian rangelands, J. Arid Environ., 41, 231-245, doi: 10.1006/jare. 1998.0475.
59. Hoogmoed, W B., and L. Stroosnijder (1984), Crust formation on sandy soils in the Sahel. 1. Rainfall and infiltration, Soil Tillage Res., 4, 5-23, doi: 10.1016/0167-1987(84)90013-8.
60. Hulme, M., R. Doherty, T. Ngara, M. New, and D. Lister (2001), African climate change: 1900-2100, Clim. Res., 17, 145-168, doi: 10.3354/cr017145.
61. Igwe, C. A. (2005), Erodibility in relation to water-dispersible clay for some soils of eastern Nigeria, Land Degrad. Dev., 16, 87-96, doi: 10.1002/ldr.647. (Pubitemid 40318550)
62. Kalma, J. D., and S. W. Franks (2003), Rainfall in arid and semi-arid regions, in Understanding Water in a Dry Environment: Hydrological Processes in Arid and Semiarid Zones, Int. Contrib. Hydrogeol, vol.23, edited by I. Simmers, pp. 15-63, Balkema, Lisse, Netherlands.
63. Kendall, C., and R. Aravena (2000), Nitrate isotopes in groundwater systems, in Environmental Tracers in Subsurface Hydrology, edited by P. G. Cook and A. Herczeg, pp. 261-297, Kluwer Acad, Dordrecht, Netherlands.
64. Kho, R. M., B. Yacouba, M. Yaye, B. Katkore, A. Moussa, A. Iktam, and A. Mayaki (2001), Separating the effects of trees on crops: The case of Faidherbia albida and millet in Niger, Agrofor. Syst., 52, 219-238, doi;10.1023/A: 1011820412140.
65. Kreitler, C. W., and D. C. Jones (1975), Natural soil nitrate: The cause of the nitrate contamination of groundwater in Runnels County, Texas, Ground Water, 13, 53-62, doi: 10.1111/j.l745-6584.1975.tb03065.x.
66. L'Hôte, Y., G. Mahé, B. Some, and J.-P. Triboulet (2002), Analysis of Sahelian annual rainfall index from 1896 to 2000: The drought continues, Hydrol. Sci. J., 47, 563-572.
67. Labbo, R., A. Fouta, I. Jeanne, I. Ousmane, and J.-B. Duchemin (2004), Anopheles funestus in Sahel: New evidence from Niger, Lancet, 363(9409), 660, doi: 10.1016/S0140.
68. Lambin, E. F., H. J. Geist, and E. Leperse (2003), Dynamics of land use and cover change in tropical regions, Anna. Rev. Environ. Resour., 28, 205-241, doi: 10.1146/annurev.energy.28.050302.105459.
69. Lang, J., et al. (1990), The Continental Terminal in West Africa, J. Afr. Earth Sci, 10, 79-99, doi: 10.1016/0899-5362(90)90048-J.
70. Leaney, F. W., A. L. Herczeg, and G. R. Walker (2003), Salinization of a fresh palaeo-ground water resource by enhanced recharge, Ground Water, 41, 84-92, doi: 10.1111/j.l745-6584.2003.tb02571.x.
71. Le Barbé, L., T. Lebel, and D. Tapsoba (2002), Rainfall variability in West Africa during the years 1950-90, J. Clim., 15, 187-202, doi: 10.1175/1520-0442(2002)015 0187: RVIWAD 2.0.CO;2.
72. Lebel, T., J.-D. Taupin, andN. D'Amato (1997), Rainfall monitoring during Hapex-Sahel. 1. General rainfall conditions and climatology, J. Hydrol., 188-189, 74-96, doi: 10.1016/S0022-1694(96)03155-1. (Pubitemid 27268692)
73. Leblanc, M., G. Favreau, S. Tweed, C. Leduc, M. Razack, and L. Mofor (2007), Remote sensing for groundwater modelling in large semiarid areas: Lake Chad Basin, Africa, Hydrogeol. J., 15, 97-100, doi: 10.1007/sl 0040-006-0126-130.
74. Leblanc, M., G. Favreau, S. Massuel, S. Tweed, M. Loireau, and B. Cappelaere (2008), Land clearance and hydrological change in the Sahel: SW Niger, Global Planet. Change, 61, 135-150, doi: 10.1016/j.gloplacha. 2007.08.011.
75. Leduc, C, and M. Loireau (1997), Fluctuations piézomé triques et évolution du couvert végétal en zone sahélienne (sud-ouest du Niger), in Sustain-ability of Water Resources Under Increasing Uncertainty, edited by D. Rosbjerg et al., IAHS Publ, 240, 193-200.
76. Leduc, C, and J.-D. Taupin (1997), Hydrochimie et recharge de la nappe phréatique du Continental Terminal (Niamey, Niger), in Hydrochemistry, edited by N. E. Peters and A. Coudrain-Ribstein, IAHS Publ., vol.244, pp. 235-243.
77. Leduc, C, J. Bromley, and P. Schroeter (1997), Water-table fluctuation and recharge in semi-arid climate: Some results of the Hapex-Sahel hydro-dynamic survey (Niger), J. Hydrol, 188-189, 123-138, doi: 10.1016/S0022-1694(96)03156- 3163
78. Leduc, C, G. Favreau, and P. Schroeter (2001), Long-term rise in a Sahelian water table: The Continental Terminal in south-west Niger, J. Hydrol., 243, 43-54, doi: 10.1016/S0022-1694(00)00403-0. (Pubitemid 32176622)
79. 14C) in an unconfined aquifer in a semiarid area, Iullemeden Basin, Niger, J. Hydrol, 254, 145-156, doi: 10.1016/S0022-1694(01)00491-7.
80. Legchenko, A., J.-M. Baltassat, A. Bobachev, C. Martin, H. Robain, and J.-M. Vouillamoz (2004), Magnetic resonance sounding applied to aquifer characterization, Ground Water, 42, 363-373, doi: 10.1111/j.l745-6584.2004. tb02684.x.
81. Le Maitre, D. C, D. F. Scott, and C. Colvin (1999), A review of information on interactions between vegetation and groundwater, Water SA, 25, 137-152.
82. Lezine, A.-M. (2007), Pollen records, postglacial, Africa, in Encyclopedia of Quaternary Science, edited by S. A. Elias, pp. 2681-2699, Elsevier, Amsterdam.
83. Li, K. Y, M. T. Coe, N. Ramankutty, and R. De Jong (2007), Modeling the hydrological impact of land use change in West Africa, J. Hydrol., 337, 258-268, doi: 10.1016/j.jhydrol.2007.01.038. (Pubitemid 46551127)
84. Loireau, M. (1998), Espaces, ressources, usages: Spatialisation des interactions dynamiques entre les systèmes sociaux et les sytèmes écologiques au Sahel nigerien, PhD thesis, 411 pp., Univ. Montpellier III, Montpellier, France.
85. Lørup, J. K., J. C. Refsgaard, and D. Mazvimavi (1998), Assessing the effect of land use change on catchment runoff by combined use of statistical tests and hydrological modelling: Case studies from Zimbabwe, J. Hydrol. , 205, 147-163, doi: 10.1016/S0168-l176(97)00311-319
86. Lubczynski, M., and J. Roy (2005), MRS contribution to hydrogeological system parametrization, Near Surf. Geophys., 3, 131-139.
87. Mahé, G., and J.-C. Olivry (1999), assessment of freshwater yields to the ocean along the intertropical Atlantic coast of Africa (1951 -1989), C. R. Acad. Set. Ser. 11a Sci. Terre Planetes, 328, 621-626, doi.10.1016/S1251- 8050(99)80159-l.
88. Mahé, G., J.-E. Paturel, E. Servat, D. Conway, and A. Dezetter (2005), The impact of land use change on soil water holding capacity and river flow modelling in the Nakambe river, Burkina-Faso, J. Hydrol, 300, 33-43, doi: 10.1016/j.jhydrol.2004.04.028. (Pubitemid 39588503)
89. Malam Issa, O., L. J. Stal, C. Défarge, A. Coute, and J. Trichet (2001), Nitrogen fixation by microbial crusts from desiccated Sahelian soils (Niger), Soil Biol. Biochem., 33, 1425-1428, doi: 10.1016/S0038-0717(01)00046-53
90. Martin-Rosales, W., and C. Leduc (2003), Dynamics of emptying of a temporary pond in the Sahel: The case study of Banizoumbou (south western Niger), C. R. Geosci., 335, 461-468, doi: 10.1016/S1631-0713(03)00059-2. (Pubitemid 36873006)
91. Massuel, S. (2005), Evolution récente de la ressource en eau consécutive aux changements climatiques et environnementaux du sud-ouest Niger. Modelisation des eaux de surface et souterraines du bassin du kori de Dantiandou sur la période 1992-2003, Ph.D. thesis, 220 pp., Univ. Montpellier II, Montpellier, France.
92. Massuel, S., G. Favreau, M. Descloitres, Y. Le Troquer, Y. Albouy, and B. Cappelaere (2006), Deep infiltration through a sandy alluvial fan in semiarid Niger inferred from electrical conductivity survey, vadose zone chemistry and hydrological modelling, Catena, 67, 105-118, doi: 10.1016/j.catena.2006.02.009.
93. McMahon, P. B., and J. K. Böhlke (2006), Regional patterns in the isotope composition of natural and anthropogenic nitrate in groundwater, High Plains, USA, Environ. Sci. Technol, 40, 2965-2970, doi: 10.1021/es052229q. (Pubitemid 43673299)
94. McMahon, P. B., K. F. Dennehy, B. W. Bruce, J. K. Böhlke, R. L. Michel, J. J. Gurdak, and D. B. Hurlbut (2006), Storage and transit time of chemicals in thick unsaturated zones under rangeland and irrigated cropland, High Plains, United States, Water Resour. Res., 42, W03413, doi: 10.1029/2005 WR004417.
95. Mortimore, M., M. Ba, A. Mahamane, R. S. Rostom, and B. Turner (2005), Changing systems and changing landscapes: Measuring and interpreting land use transformation in African drylands, Geogr. Tidsskr., 105, 45-62.
96. Nicholson, S. E., B. Some, and B. Kone (2000), An analysis of recent rainfall conditions in West Africa, including the rainy seasons of the 1997 El Nino and the 1998 La Nina years, J. Clim., 13, 2628-2640, doi: 10.1175/1520-0442(2000)013 2628: AAORRC 2.0.CO;2.
97. Nickling, W. G., and S. A. Wolfe (1994), The morphology and origin of nabkhas, region of Mopti, Mali, West Africa, J. Arid Environ., 28, 13-30, doi: 10.1016/S0140-1963(05)80017-5.
98. 22Ne ratios, Geochim. Cosmochim. Acta, 67, 587-600, doi: 10.1016/S0016-7037(02)00969- 9.
99. Peugeot, C, M. Esteves, S. Galle, J.-L. Rajot, and J. P. Vandervaere (1997), Runoff generation processes: Results and analysis of field data collected at the east central supersite of the HAPEX-Sahel experiment, J. Hydrol., 188-189, 179-202, doi: 10.1016/S0022-1694(96)03159-9.
100. Peugeot, C, B. Cappelaere, B. E. Vieux, L. Séguis, and A. Maia (2003), Hydrologic process simulation of a semiarid, endoreic catchment in Sahelian West Niger: 1. Model-aided data analysis and screening, J. Hydrol., 279, 224-243, doi: 10.1016/S0022-1694(03)00181-1.
101. Raynaut, C. (2001), Societies and nature in the Sahel: Ecological diversity and social dynamics, Global Environ. Change, 11, 9-18, doi: 10.1016/S0959-3780(00)00041-48
102. Redelsperger, J.-L., C. D. Thomcroft, A. Diedhiou, T. Lebel, D. J. Parker, and J. Polcher (2006), African monsoon multidisciplinary analysis: An international research project and field campaign, Bull. Am. Meteorol. Soc., 87, 1739-1746, doi: 10.1175/BAMS-87-12-1739. (Pubitemid 46152000)
103. Reenberg, A., T. Louring-Nielsen, and K. Rasmussen (1998), Field expansion and reallocation in the Sahel-Land-use pattern dynamics in a fluctuating biophysical and socio-economic environment, Global Environ. Change, 8, 309-327, doi: 10.1016/S0959-3780(98)00003-X.
104. Ribolzi, O., M. Hermida, H. Karambiri, J.-P. Delhoume, and L. Thiombiano (2006), Effects of aeolian processes on water infiltration in sandy Sahelian rangeland in Burkina-Faso, Catena, 67, 145-154, doi: 10.1016/j.catena.2006.03. 006. (Pubitemid 44572645)
105. Rockström, J., and J. Barron (2007), Water productivity in rainfed systems: Overview of challenges and analyses of opportunities in water scarcity prone savannahs, Irrig. Sci., 25, 299-311, doi: 10.1007/s00271-007-0062-3. (Pubitemid 46411948)
106. Rockström, J., J. Barron, J. Brouwer, S. Galle, and A. de Rouw (1999), On farm temporal and spatial variability of soil and water in pearl millet cultivation, Soil Sci. Soc. Am. J., 63, 1308-1319.
107. Scanlon, B. R., D. G. Levitt, R. C. Reedy, K. E. Keese, and M. J. Sully (2005a), Ecological controls on water-cycle response to climate variability in deserts, Proc. Natl. Acad. Sci. U. S. A., 102, 6033-6038, doi: 10.1073/pnas.0408571102. (Pubitemid 40594250)
108. Scanlon, B. R., R. C. Reedy, D. A. Stonestrom, D. E. Prudic, and K. F. Dennehys (2005b), Impact of land use and land cover change on groundwater recharge and quality in the southwestern US, Global Change Biol., 11, 1577-1593, doi: 10.1111/j.l365-2486.2005.01026.x.
109. Scanlon, B. R., K. E. Keese, A. L. Flint, L. E. Flint, C. B. Gaye, W. M. Edmunds, and I. Simmers (2006), Global synthesis of groundwater recharge in semiarid and arid regions, Hydrol. Processes, 20, 3335-3370, doi: 10.1002/hyp.6335. (Pubitemid 44604595)
110. Scanlon, B. R., I. Jolly, M. Sophocleous, and L. Zhang (2007), Global impacts of conversions from natural to agricultural ecosystems on water resources: Quantity versus quality, Water Resour. Res., 43, W03437, doi: 10.1029/2006WR005486. (Pubitemid 46691037)
111. Séguis, L., B. Cappelaere, G. Milesi, C. Peugeot, S. Massuel, and G. Favreau (2004), Simulated impacts of climate change and land-clearing on runoff from a small Sahelian catchment, Hydrol. Processes, 18, 3401-3413, doi: 10.1002/hyp.l503.
112. Siébert, S., P. Doll, J. Hoogeveen, J. M. Faures, K. Frenken, and S. Feick (2005), Development and validation of the global map of irrigation areas, Hydrol. Earth Syst. Set., 9, 535-547.
113. Simmers, I. (1997), Groundwater recharge principles, problems and developments, Recharge of Phreatic Aquifers in (Semi-) Arid Areas, Int. Assoc., of Hydrogeol, vol.19, edited by I. Simmers, pp. 1-18, Balkema, Rotterdam, Netherlands.
114. Stonestrom, D. A., D. E. Prudic, R. L. Laczniak, and K. C. Akstin (2004), Tectonic, climatic and land-use controls on groundwater recharge in an arid alluvial basin: Amargosa desert, USA, in Groundwater Recharge in a Desert Environment: The Southwestern United States, Water Sci. Appl., vol.9, edited by J. F. Hogan, F. M. Philipps, and B. Scanlon, pp. 29-47, AGU, Washington, D.C.
115. Taupin, J.-D., G. Gaultier, G. Favreau, C. Leduc, and C. Marlin (2002), Isotopic variability of Sahelian rainfall at different time steps in Niamey (Niger, 1992-1999), climatic implications, C. R. Geosci., 334, 43-50, doi: 10.1016/S1631-0713(02)01702-9. (Pubitemid 34923517)
116. Taylor, C. M, E. F. Lambin, N. Stephenne, R. J. Harding, and R. L. H. Essery (2002), The influence of land use change on climate in the Sahel, J. Clim., 15, 3615-3629, doi: 10.1175/1520-0442(2002)015 3615: TIOLUC 2.0.CO;2.
117. Tengberg, A. (1995), Nebkha dunes as indicators of wind erosion and land degradation in the Sahel zone of Burkina Faso, J. Arid Environ., 30, 265-282, doi: 10.1016/S0140-1963(05)80002-3.
118. Valentin, C, J.-L. Rajot, and D. Mitja (2004), Responses of soil crusting, runoff and erosion to fallowing in the subhumid and semi-arid regions of West Africa, Agric. Ecosyst. Environ., 104, 287-302, doi: 10.1016/j.agee.2004.01.035. (Pubitemid 39415805)
119. Valenza, A., J.-C. Grillot, and J. Dazy (2000), Influence of groundwater on the degradation of irrigated soils in a semi-arid region, the inner delta of the Niger River, Mali, Hydrogeol. J., 8, 417-429, doi: 10.1007/PL00010977.
120. Vandersypen, K., A. C. T. Keita, Y. Coulibaly, D. Raes, and J.-Y. Jamin (2007), Formal and informal decision making on water management at the village level: A case study from the office du Niger irrigation scheme (Mali), Water Resour. Res., 43, W06419, doi: 10.1029/2006WR005132.
121. Viramontes, D., and L. Descroix (2003), Changes in the surface water hydro logic characteristics of an endoreic basin of northern Mexico from 1970 to 1998, Hydrol. Processes, 17, 1291-1306, doi: 10.1002/hyp.1285. (Pubitemid 36611012)
122. Vouillamoz, J.-M., G. Favreau, S. Massuel, M. Boucher, Y Nazoumou, and A. Legchenko (2008), Contribution of magnetic resonance sounding to aquifer characterization and recharge estimate in semiarid Niger, J. Appl. Geophys., 64, 99-108, doi: 10.1016/j.jappgeo.2007.12.006.
123. Warner, T. T. (2004), Desert Meteorology, 612 pp., Cambridge Univ. Press, Cambridge, U.K.
124. Wei, W., L. Chen, B. Fu, Z. Huang, D. Wu, and L. Gui (2007), The effect of land uses and rainfall regimes on runoff and soil erosion in the semi-arid loess hilly area, China, J. Hydrol., 335, 247-258, doi: 10.1016/j.jhydrol.2006. 11.016. (Pubitemid 46281953)
125. Wilcox, B. P. (2007), Does rangeland degradation have implications for global streamflow?, Hydrol. Processes, 21, 2961-2964, doi: 10.1002/hyp.6856. (Pubitemid 47604390)
126. Wood, W. W., and W E. Sanford (1995), Chemical and isotopic methods for quantifying groundwater recharge in a regional, semiarid environment, Ground Water, 33, 458-468. doi: 10.1111/j.1745-6584.1995.tb00302.x.